HighCVE-2025-22037

    Linux Kernel: NULL Pointer Dereference (CVE-2025-22037)

    Published Last modified Sources: Msrc Update Guide, CVE.org, EUVD, BSI

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    What is affected, what to do

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in alloc_preauth_hash() The Client send malformed smb2 negotiate request. ksmbd return error response. Subsequently, the client can send smb2 session setup even thought conn->preauth_info is not allocated.

    Update Linux Kernel to version 6.1.191, Linux Kernel to version 6.6.107, Linux Kernel to version 6.12.23.

    Affected
    • Linux Kernel lt 5.15..6.1.191
    • Linux Kernel lt 6.2..6.6.107
    • Linux Kernel lt 6.7..6.12.23
    • Linux Kernel lt 6.13..6.13.11
    • Linux Kernel lt 6.14..6.14.2
    Fixed in
    • Linux Kernel 6.1.191
    • Linux Kernel 6.6.107
    • Linux Kernel 6.12.23
    • Linux Kernel 6.13.11
    • Linux Kernel 6.14.2
    • Linux Kernel 6.15

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Msrc Update Guide, CVE.org, EUVD, BSI

    68.8 %

    EPSS score

    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.

    Source: FIRST EPSS, percentile 99.35

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    124.99 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    68.8 %
    High — model estimates ≥ 50% chance of real-world exploitation within 30 days.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    99.35
    Critical — this CVE ranks in the top fifth of all CVEs scored today (rank ≥ 80%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in alloc_preauth_hash() The Client send malformed smb2 negotiate request. ksmbd return error response. Subsequently, the client can send smb2 session setup even thought conn->preauth_info is not allocated. This patch add KSMBD_SESS_NEED_SETUP status of connection to ignore session setup request if smb2 negotiate phase is not complete.

    Source: Microsoft Security Update Guide, cvelistv5, NVD (NIST), CVE.org (MITRE), ENISA EUVD, BSI WID Portal, BSI CSAF

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    LinuxLinux
    • —
    • 6.7 – < 6.12.23
    • 5.15 – < 6.1.191
    • 6.13 – < 6.13.11
    • 6.14 – < 6.14.2
    • 6.2 – < 6.6.107
    • 6.15
    • 6.12.23
    • 6.1.191
    • 6.13.11
    • 6.14.2
    • 6.6.107
    DellPowerProtect Data Domain OS
    • < 8.3.1.20
    • < 8.3.1.30
    • < 8.7.0.1
    • < 7.13.1.60
    • < 7.13.1.70
    • < 8.6.0.0
    • < 8.7.0.0
    • 8.3.1.20
    • 8.3.1.30
    • 8.7.0.1
    • 7.13.1.60
    • 7.13.1.70
    • 8.6.0.0
    • 8.7.0.0

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxlinuxlinux_kernel—

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedLinux

      Show 20 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2025/22xxx/CVE-2025-22037.json">CVE-2025-22037</a>
      Referenceadded
      —
      https://git.kernel.org/stable/c/2d3461d6ae74ebdcd4d65128c855198649bcadcd
      Referenceadded
      —
      https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d
      Referenceadded
      —
      https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335
      Referenceadded
      —
      https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780
      Referenceadded
      —
      https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad
      Referenceadded
      —
      https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6
      Referenceadded
      —
      https://www.zerodayinitiative.com/advisories/ZDI-25-310/
      Referenceremoved
      https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d
      —
      Referenceremoved
      https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335
      —
      Referenceremoved
      https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780
      —
      Referenceremoved
      https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad
      —
      Referenceremoved
      https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6
      —
      Referenceremoved
      https://www.zerodayinitiative.com/advisories/ZDI-25-310/
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780 Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad Types: Patch
      —
      Reference typeremoved
      https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6 Types: Patch
      —
      Reference typeremoved
      https://www.zerodayinitiative.com/advisories/ZDI-25-310/ Types: Third Party Advisory
      —

      Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    2. NVD analysis modifiedNVD

      Product mapping changed:
      • Linux Kernel (6.13 – before 6.13.11; 6.14 – before 6.14.2; 6.12 – before 6.12.23; 6.6 – before 6.6.107)

      CVSS V3.1: before AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, after —

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSremoved
      AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
      —
      Product configurationchanged
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.13.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.14 up to (excluding) 6.14.2 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 6.12.23
      OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.13.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.14 up to (excluding) 6.14.2 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12 up to (excluding) 6.12.23 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6 up to (excluding) 6.6.107
      Reference typeadded
      —
      kernel.org: https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6 Types: Patch
      Reference typeadded
      —
      kernel.org: https://www.zerodayinitiative.com/advisories/ZDI-25-310/ Types: Third Party Advisory

      Source identifier: nvd@nist.gov

    3. Record modifiedLinux

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

      Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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